Hi,

Great script! I have some questions regarding the script:

What is the maximum number of users that the script can handle? I heard that it is using hash directory to divide users to different directories. What is the maximum number of file or directory in one directory can linux file system handles?

Can the script limits the maximum space that user can use? (ie. max 5MB?) Do the script support compression on files? For example, the user's mail are compressed to a file (tar and gzipped). It will uncompress and look for mails when it need to add, read or delete the mail? (Other word, the compressed file will act like a user's mailbox). It has some speed trade off, but it generally a very good feature as ASCII file's compression ratio is very high. So that a system can handle many user without worry about run out of space.

Also, about the mail bouncing feature. Is it possible to implement like this?
First a external person send a mail to a non-exist user in our system.
The system found out the user is not exist when parsing the pop.
The system will then register the email address, time & date to a database.
Then it will fire off a email to that email saying the email is not exist.
Anther side may have auto-reply feature, then it will possible create a mail loop.
But when second auto-reply come to the system, the system checks in the database if the email has been bounce back within a time (ie. 24 hours). If it exists, then igrone it.

Is it possible to implement like this?

Thanks for your time!

Ployon